JP4443124B2 - Small planing boat - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a small planing boat including a water jet pump that forms a propulsion mechanism of a boat, and more particularly, to a drain structure that discharges liquid accumulated in an intake chamber that supplies intake air to an engine mounted on the small planing boat. .
[0002]
[Prior art]
In recent years, so-called jet propulsion type personal watercrafts have been widely used for leisure, sports or rescue. The small planing boat includes an engine in a space surrounded by the hull and the deck, and pressurizes and sucks water sucked from a water inlet provided on a bottom surface of the hull with a water jet pump driven by the engine. The propulsion of the hull is obtained by accelerating and injecting backwards.
[0003]
The planing boat uses outside air taken in through an intake system (consisting of parts such as an intake box, an intake pipe, an intake chamber, and an intake manifold) as intake air for the engine, but the planing boat is taken in because it is used on the water. The outside air contains a lot of moisture.
[0004]
In order to prevent moisture in the air from being carried to the engine, a gas-liquid separation structure may be provided in the intake box. As a result, most of the moisture is separated from the air, but the air still contains some moisture, and this moisture is carried along with the air, and the intake air provided in the intake system for the purpose of mitigating intake interference etc. Part of it accumulates in the chamber.
[0005]
As an example of discharging the liquid in the container, a push type valve is known at the bottom of a fuel tank of an agricultural machine driven by an engine. Agricultural machinery generally has its fuel tank exposed, and when not in use for a long period of time, the push type valve provided in the fuel tank is operated directly to extract the fuel remaining inside. (For example, refer to Patent Document 1).
[0006]
[Patent Document 1]
No. 7-23570
[0007]
[Problems to be solved by the invention]
By the way, in the case of a so-called riding type personal watercraft, a seat for riding is provided at the upper part of the hull, and a deck opening leading to the inside of the ship is provided below the seat. The personal watercraft is equipped with an engine and auxiliary equipment (including an intake system) in a relatively narrow space inside the ship. Maintenance of the engine in the ship is performed through the deck opening.
[0008]
However, the intake chamber may be disposed relatively near the bottom of the ship, and it is difficult to access the intake chamber from the deck opening. Therefore, even when a push-type valve is provided at the bottom of the intake chamber, it is difficult to open the valve and discharge the internal moisture.
[0009]
On the other hand, in order to eliminate the difficulty in accessing the intake chamber, it may be possible to eliminate the push-type valve and simply provide a pore at the bottom of the intake chamber. When it was adopted, it was found that the following new problems were revealed.
[0010]
That is, a throttle valve is provided in an intake pipe constituting an intake system of a personal watercraft, and intake air corresponding to the opening degree of the throttle valve is supplied to the engine. When the engine is driven, a negative pressure is felt from the throttle valve to the engine. In particular, when idling, the throttle valve is in a state of being almost fully closed, and a negative pressure is obtained during the period from the throttle valve to the engine. However, idling of the engine is generally not stable unless this pressure is sufficiently low.
[0011]
When the intake chamber has pores for draining moisture, outside air is introduced through the pores while the engine is running, so that a sufficient negative pressure is maintained from the throttle valve to the engine during idling. This is not preferable.
[0012]
Accordingly, an object of the present invention is to provide a personal watercraft having a drain structure that can discharge liquid accumulated inside by opening / closing a drain hole without directly accessing the intake chamber. To do.
[0013]
[Means for Solving the Problems]
The present invention has been made in view of the above circumstances, and a small planing boat according to the present invention includes a water jet pump that constitutes a propulsion mechanism for a boat. The small planing boat has a drain hole provided in a bottom portion of an intake chamber provided in an intake system of an engine that drives the water jet pump, and the liquid is discharged through the drain hole by an operation at a position separated from the intake chamber. Drain means for discharging is provided.
[0014]
With such a configuration, the drain hole can be opened / closed by an operation at a position separated from the intake chamber, so that the liquid can be easily discharged without directly accessing the drain hole. It can be carried out.
[0015]
The drain means may be configured using a valve body that opens / closes the drain hole and an operation unit for operating the valve body at a position separated from the valve body. Specifically, the valve body is made of rubber having a cross section slightly larger than the opening of the drain hole, and is movable inward and outward of the intake chamber along the direction of liquid flow through the drain hole. . A cable is used as the operation portion, and one end of the cable is connected to the valve body.
[0016]
With this configuration, the valve body can be moved by pushing and pulling the other end of the cable, and the drain hole can be opened / closed. The valve body can be driven electrically using an actuator such as an electromagnetic solenoid. In this case, an operation unit such as a switch may be provided to give an electric signal to the actuator.
[0017]
Further, an urging member made of a spring or the like may be provided to urge the valve body in the direction in which the drain hole is closed. In this case, the operation portion only needs to be operated when the drain hole is opened, and if the operation portion is not operated, the valve body automatically closes the drain hole by the urging member, so that operability is good.
[0018]
Various specific configurations of the valve body are conceivable. FIG. 9 shows the principal configuration in principle. FIG. 9A shows a push-type valve body, and FIG. 9B shows a pull-type valve body.
[0019]
The push type valve body 100 shown in FIG. 9A moves inward and outward of the intake chamber 101 along the direction of liquid flow through the drain hole 102 with respect to the drain hole 102 provided in the intake chamber 101. Is possible. Further, the drain hole 102 is opened when it is relatively located inside the intake chamber 101, and is closed when it is located outside. Further, the biasing member 103 relatively biases the outside of the intake chamber 101.
[0020]
In the pull type valve element 104 shown in FIG. 9B, the urging direction of the urging member and the relationship between the position of the valve element and the opening / closing of the drain hole are reversed compared to the push type valve element 100. It has become. That is, the drain hole 102 is opened when it is relatively located outside the intake chamber 101 and is closed when it is located inside, and is relatively urged to the inside of the intake chamber 101 by the urging member 103. .
[0021]
The push-type or pull-type valve bodies 100 and 104 described above can be realized with a relatively simple configuration. In the case of the pull-type valve body 104, the valve body 104 is drawn into the intake chamber 101 due to the negative pressure of the intake chamber 101 while the engine is being driven, and the drain hole 102 is not opened. The hole 102 can be closed.
[0022]
Further, in the valve bodies 100 and 104 shown in FIGS. 9A and 9B, a portion that contacts the drain hole 102 when closed (that is, a portion that contacts the valve seat) may be formed in a tapered shape. In this case, airtightness when the drain hole is closed by the valve body is improved. When the valve body is formed so as to match the shape of the valve seat, the airtightness is further improved.
[0023]
FIG. 9C shows a direct-acting slide type valve element, and FIG. 9D shows a rotary slide type valve element, both of which intersect the liquid flow through the drain hole 102. Along the direction, it is possible to move between a position where the drain hole 102 is opened and a position where the drain hole 102 is closed.
[0024]
The slide-type valve body 105 shown in FIG. 9C is movable in the vertical direction, and opens the drain hole 102 when positioned above and closes when positioned below. A weight 106 is suspended from the valve body 105 and is urged downward.
[0025]
The rotary slide type valve element 107 shown in FIG. 9D has, for example, a disc shape with a part cut away, and can rotate around its center 108. Then, when the valve body 107 rotates, the drain hole 102 is opened when the position of the notched portion and the drain hole 102 coincides.
[0026]
FIG. 9E shows a rotary valve body. The valve body 109 has, for example, a cylindrical shape having a through hole 110 in the transverse direction, and can rotate around its axis 112 while the drain hole 102 is closed by the outer peripheral surface 111. When the through hole 110 communicates with the drain hole 102 by rotating around the shaft 112, the drain hole 102 is opened.
[0027]
The above-described direct-acting slide type, rotary slide type, or rotary type valve elements 105, 107, and 109 have different movement directions from the liquid flowing direction through the drain hole 102. Regardless of the negative pressure generated, the drain hole 102 can be reliably sealed at the time of closing without necessarily requiring an urging member. However, a biasing member may be provided to bias the valve body in the direction of the position where the drain hole is closed. In this case, the operation portion only needs to be operated when the drain hole is opened. Sexuality improves.
[0028]
9A to 9E, the drain hole 102 is covered with one opening of the rubber tube together with the valve body outside the intake chamber 101, and the other opening extends to the outside of the boat. In this case, the liquid discharged from the drain hole 102 does not accumulate in the boat and can be discharged directly to the outside of the boat. Further, the drain hole 102 provided in the intake chamber 101 may be provided in the bottom wall portion of the intake chamber 101, and when provided in the side wall portion, it is preferably provided as close to the bottom as possible.
[0029]
As another configuration of the drain means, one using a tube in place of the valve body and the operation unit may be considered. That is, one end of a communication tube such as a rubber tube may be connected to the bottom of the intake chamber, the other end may be sealed with a stopper, and the other end may be disposed in the vicinity of the deck opening provided in the upper part of the hull.
[0030]
In this case, when discharging the liquid in the intake chamber, the stopper can be removed, and a pump can be connected to the other end of the communication pipe to suck out the liquid by vacuum. Further, since the other end of the communication pipe is sealed with a stopper when the planing boat is operated, the outside air is not sucked into the intake chamber through the communication pipe.
[0031]
Furthermore, the liquid in the intake chamber can be sucked out by connecting the exhaust passage (exhaust passage comprising exhaust port, exhaust manifold, exhaust pipe, muffler, etc.) and the bottom of the intake chamber with a communication pipe. it can.
[0032]
That is, exhaust pulsation is generated in the exhaust passage by driving the engine, and positive pressure and negative pressure are alternately generated. Therefore, when the pressure in the exhaust passage is negative, the liquid can be sucked from the intake chamber through the communication pipe and discharged into the exhaust passage. Further, in order to prevent the exhaust from flowing from the exhaust passage to the intake chamber when the inside of the exhaust passage is at a positive pressure, it may be connected by a communication pipe through a one-way valve.
[0033]
In this case, since the liquid in the intake chamber can be discharged while the engine is driven, a large amount of liquid does not accumulate in the intake chamber, and the operation of discharging the liquid does not necessarily have to be performed. Further, since the liquid discharged into the exhaust passage is evaporated by touching the high-temperature exhaust, there is an advantage that no post-treatment is required.
[0034]
In general, in order to re-combust engine exhaust, so-called secondary air may be introduced into the passage by connecting a pipe line to the exhaust passage. In the case of such an engine, in order to use the existing configuration, a pipe line connected to the exhaust passage may be branched in the middle, and the tip of the branch pipe may be connected to the bottom of the intake chamber.
[0035]
In order to efficiently suck liquid from the intake chamber to the exhaust passage, it is desirable that the end opening of the communication pipe connected to the intake chamber be relatively small. Further, during the operation of the engine, a negative pressure based on exhaust pulsation is more likely to occur in a position closer to the combustion chamber of the engine in the exhaust passage. Therefore, it is desirable to connect the bottom of the intake chamber and the position near the combustion chamber in the exhaust passage by a communication pipe.
[0036]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a personal watercraft according to an embodiment of the present invention will be specifically described with reference to the drawings. First, a small planing boat to which the present invention is applied will be exemplified and an outline thereof will be described.
[0037]
The planing boat shown in FIG. 1 is a riding type planing boat on which an operator rides on a seat, and its hull 1 is composed of a hull 2 and a deck 3 that covers the top of the hull 2. A connecting line between the hull 2 and the deck 3 over the entire circumference of the hull 1 is referred to as a gunnel line 4. Moreover, the code | symbol 5 in FIG. 1 has shown the waterline in the state with the small planing boat which concerns on this Embodiment.
[0038]
As shown in FIG. 2, a substantially rectangular deck opening 6 in a plan view is provided at a substantially central position of the deck 3 in the upper part of the hull 1 so as to be along the front-rear direction of the hull 1. A seat 7 is detachably attached above the deck opening 6.
[0039]
An engine room 8 is formed in a space surrounded by the hull 2 and the deck 3 below the deck opening 6, and a water jet pump P serving as a propulsion mechanism for the planing boat is provided in the engine room 8. An engine E to be driven is mounted. In addition, the engine room 8 has a convex cross section and a shape in which the upper part is narrower than the lower part. In the present embodiment, the engine E is an in-line four-cylinder four-cycle engine.
[0040]
As shown in FIG. 1, the engine E is arranged such that the crankshaft 10 is along the front-rear direction of the hull 1. An output end portion of the crankshaft 10 is connected to a pump shaft 12 of a water jet pump P disposed at a rear portion of the hull 1 via a propeller shaft 11. Accordingly, the pump shaft 12 rotates in conjunction with the rotation of the crankshaft 10. An impeller 13 is attached to the pump shaft 12, and a stationary blade 14 is disposed behind the impeller 13. A pump casing 15 is provided on the outer periphery of the impeller 13 so as to cover the impeller 13.
[0041]
A water inlet 16 is provided at the bottom of the hull 1. The water inlet 16 and the pump casing 15 are connected by a water absorption passage 17, and the pump casing 15 is further connected to a pump nozzle 18 provided at the rear part of the hull 1. The pump nozzle 18 is configured such that the nozzle diameter decreases toward the rear, and an injection port 19 is disposed at the rear end.
[0042]
The planing boat pressurizes and accelerates the water sucked from the water suction port 16 by the water jet pump P, rectifies it by the stationary blade 14, and discharges the water backward from the jet port 19 through the pump nozzle 18. . The planing boat obtains a propulsive force by the reaction of the water discharged from the injection port 19.
[0043]
A steering handle 20 is provided at the front of the deck 3, and the steering handle 20 is connected to a steering nozzle 21 disposed behind the pump nozzle 18 via a cable 22 shown in FIG. 2. . By operating the steering handle 20 left and right, the steering nozzle 21 is swung left and right. Therefore, the direction of water discharged to the outside through the pump nozzle 18 can be changed, and the direction of the planing boat can be changed.
[0044]
As shown in FIG. 1, a bowl-shaped deflector 23 is disposed at the rear of the hull 1 and above the steering nozzle 21. The deflector 23 is supported by a swing shaft 24 whose axis is directed in the left-right direction of the planing boat, and can swing up and down about the swing shaft 24. When the deflector 23 is swung downward about the rocking shaft 24 and positioned behind the steering nozzle 21, the discharge direction of the water discharged from the steering nozzle 21 rearward is changed substantially forward. ing. Therefore, at this time, the planing boat can be moved backward.
[0045]
As shown in FIGS. 1 and 2, a rear deck 25 is provided at the rear of the hull 1. The rear deck 25 is provided with an openable / closable hatch cover 26, and a small-capacity storage box 27 (see FIG. 1) is formed under the hatch cover 26. Further, another hatch cover 28 is provided at the front of the hull 1, and a storage box 29 (see FIG. 1) having a predetermined capacity is formed below the hatch cover 28.
[0046]
(Embodiment 1)
The configuration and operation of the drain and its peripheral devices according to the main part of the present invention will be described. As shown in FIG. 3, the engine E is disposed in the engine room 8 below the deck opening 6, and an intake air having a hollow rectangular parallelepiped shape is positioned above the rear side (stern side) of the engine E. A box 30 is arranged. The intake box 30 has an outside air inlet 31 in the upper front portion (the upper surface on the bow side) from which outside air is taken. Note that an element (not shown) is provided in the intake box 30 for removing impurities, and a labyrinth structure is provided for gas-liquid separation (not shown).
[0047]
An intake chamber 32 having a hollow rectangular parallelepiped shape is disposed at a position below the side of the engine E. An intake pipe 33 extends from the lower front portion of the intake box 30 and is connected to the back surface of the intake chamber 32 via a throttle body 34 in the middle.
[0048]
A base end portion (collecting end portion) 35 a of an intake manifold 35 that branches into four branch pipes is connected to the upper portion of the intake chamber 32 so as to protrude into the intake chamber 32. The intake manifold 35 extends upward from the base end portion 35a, and the branched tip end portion 35b of each branch pipe is connected to an intake port 37 provided for each cylinder by the cylinder head 36 of the engine E. Has been.
[0049]
In addition, although the intake chamber 32 and the intake manifold 35 shown in FIG. 3 are integrally molded, they may be separately molded.
[0050]
One end 38a of a rubber drain tube (long communication pipe) 38 is connected to the bottom of the back surface of the intake chamber 32 so as to communicate with the internal space of the intake chamber 32, and the other end 38b is connected to the deck. It is supported at the edge 39 of the deck 3 over which the opening 6 is desired. The opening 40 of the other end 38b can be sealed with a removable stopper 41.
[0051]
The outside air taken into the intake system shown in FIG. 3 is sent from the intake box 30 disposed relatively upward to the intake chamber 32 disposed relatively below through the intake pipe 33 and further upward through the intake manifold 35. And supplied from the intake port 37 into the engine E.
[0052]
Therefore, moisture having a high specific gravity contained in the outside air is provided through each part of the intake system (intake box 30, intake chamber 32, intake manifold 35, etc.) distributed and arranged above and below the boat along the flow direction. Is accumulated in the intake chamber 32 in front of the intake manifold 35 extending upward, and moisture does not easily enter the engine E.
[0053]
Further, in the personal watercraft shown in the present embodiment, the stopper 41 is provided in the opening 40 of the other end 38b of the drain tube 38 during the operation of the engine E. When draining the liquid accumulated in the intake chamber 32, the seat 7 is shifted to expose the deck opening 6, the stopper 41 is removed, and the liquid is sucked out from the other end 38b of the drain tube 38 by vacuum.
[0054]
Therefore, the liquid in the intake chamber 32 can be easily drained without directly accessing the intake chamber 32. Further, basically, it can be realized by a simple configuration in which the drain tube 38 is connected to an existing planing boat, and an increase in cost can be suppressed.
[0055]
For convenience of draining the liquid in the intake chamber 32, the other end 38b of the drain tube 38 is supported in the vicinity of the deck opening 6. However, the drain tube 38 is supported at another location that is easily accessible. Also good.
[0056]
For example, the drain tube 38 may extend backward or forward through the ship, and the other end 38 b may be supported in the storage box 27 or the storage box 29. In general, it is easier to open the hatch covers 26 and 28 than to shift the seat 7. Accordingly, when the other end 38b is supported in the storage boxes 27 and 29, the other end 38b is more easily accessible.
[0057]
In addition, a hole having substantially the same diameter as the outer diameter of the drain tube 38 may be provided in the hull 1, and the other end 38b may be supported by the hole so that the opening 40 faces outward from the ship. In this case, it is only necessary to remove the stopper 41 without the work of moving the seat 7 and the hatch covers 26 and 28.
[0058]
In the present embodiment, one end 38a of the drain tube 38 is connected to the intake chamber 32 at the bottom of the back surface, but may be connected to the bottom surface of the intake chamber 32.
[0059]
(Embodiment 2)
Another structure of the drain will be described with reference to FIGS. In addition, the part which comprises the structure similar to the structure already demonstrated is attached | subjected the same referential mark also in FIG.4, 5, and the description about the structure and effect | action is abbreviate | omitted in the following description.
[0060]
As shown in FIG. 4, a drain device (drain means) 52 including a valve unit 50 and an operation unit 51 is attached to the intake chamber 32.
[0061]
As shown in FIG. 5, a drain hole 53 for discharging the liquid in the intake chamber 32 is provided in the wall portion at the bottom of the back surface of the intake chamber 32, and the valve portion 50 is formed on the outer surface of the wall portion. And a cover member 54 that covers the drain hole 53 is provided. The cover member 54 includes a plate portion 56 having a through hole 55 and a cylindrical portion 57, and has a structure in which the cylindrical portion 57 projects from the through hole 55 coaxially. The inner diameter of the cylindrical portion 57 is slightly larger than the diameter of the through hole 55, and the edge of the plate portion 56 over which the through hole 55 is desired forms a valve seat 58. A drain groove 59 is formed in the inner surface of the cylindrical portion 57 along the axial direction.
[0062]
The cover member 54 having such a configuration is such that the shafts of the through hole 55 and the cylindrical portion 57 are along the longitudinal direction of the boat, and the drain hole 53 is in communication therewith, and the gasket 60 is further interposed therebetween. The bolt is fastened to the outer surface of the wall portion of the intake chamber 32 by the plate portion 56.
[0063]
On the cover member 54 (more precisely, on the back side of the cover member 54), a holder member 61 is bolted so as to cover the cylindrical portion 57. The holder member 61 is formed with a communication hole 62 coaxial with the cylindrical portion 57 and the through hole 55. The communication hole 62 has an inner diameter that is changed in three stages in the middle of the axial direction, a portion (hereinafter referred to as “large diameter hole”) 62a having a large diameter in order from the side closer to the cylindrical portion 57, and a portion having a small diameter. 62b (hereinafter referred to as “small-diameter hole”) and a portion (hereinafter, referred to as “medium-diameter hole”) 62c having an intermediate inner diameter between them. Note that the diameter of the large-diameter hole 62a is substantially the same as the inner diameter of the cylindrical portion 57 of the cover member 54.
[0064]
A space formed inside by the cover member 54 and the holder member 61, that is, a space formed by the inside of the cylindrical portion 57 and the large diameter hole 62a forms a continuous cylindrical space, and the valve body 63 and the liner 64 are formed. It is a valve space 65 that accommodates.
[0065]
The valve body 63 has a cylindrical shape with one end 63a closed. A hole 66 is provided at the center of the one end 63a, and the liner 64 has a stepped columnar shape. The valve body 63 and the portion 67 on the large diameter side of the liner 64 have substantially the same outer diameter and are slightly smaller than the inner diameter of the valve space 65. The valve body 63 and the liner 64 are arranged coaxially, and the other end 63 b of the valve body 63 is fitted onto the end 64 a on the small diameter side of the liner 64 to form a valve piston 68. The axial dimension of the valve piston 68 is shorter than the axial dimension of the valve space 65. Further, a tip end portion (same as one end portion 63a of the valve body 63) 68a of the valve piston 68 is notched at an edge portion to form a tapered surface (seal surface) 69.
[0066]
The valve piston 68 is accommodated in the valve space 65 with its tip 68a facing the front side of the boat. The valve piston 68 can move in the valve space 65 in the axial direction (that is, along the direction of the liquid flow through the drain hole 53).
[0067]
A coil spring 70 is accommodated on the other end 68 b side of the valve piston 68 in the valve space 65. The coil spring 70 urges the valve piston 68 along the axis toward the front side of the boat (that is, toward the drain hole 53 of the intake chamber 32). Therefore, when there is no other external force, the valve piston 68 urged by the coil spring 70 is positioned on the front side in the valve space 65, and a tapered seal surface 69 formed at the tip end portion 68 is provided. The drain hole 53 is in contact with the valve seat 58 and is sealed.
[0068]
On the other hand, one end 71 a of a long vinyl tube 71 is fixed by being fitted into the medium diameter hole 62 c of the holder member 61, and the other end 71 b extends to the deck opening 6 of the hull 1. . The deck opening 6 is provided with a support plate member 73 having a hole 72 protruding, and the other end 71b communicates with the hole 72 on one side of the support plate member 73 (the bottom surface in FIG. 5). ) 73a.
[0069]
A cable 74 is passed through the tube 71, and one end 74 a of the cable 74 passes through the inside diameter hole 62 c, the small diameter hole 62 b, the large diameter hole 62 a, and the valve piston 68 inside the holder member 61. It is fixed at the tip 68a of the piston 68. The other end 74b of the cable 74 extends in the tube 71 to a position just before the hole 72 of the support plate member 73, and extends from the other surface (upper surface in FIG. 5) 73b of the support plate member 73 to the hole. 72 is connected to a base 75 a of a handle 75 fitted into 72. A stopper 76 is formed on the base portion 75 a, and the handle 75 can be inserted through the hole 72 until the stopper 76 contacts the support plate member 73.
[0070]
As shown in FIG. 5, in the drain device 52 having such a configuration, the cable 74 and the handle 75 are urged by the coil spring 70 together with the valve piston 68 when the handle 75 is not pulled (not operated). . Therefore, the handle 75 has its stopper 76 in contact with the support plate member 73, and the valve piston 68 is located on the front side in the valve space 65 and its seal surface 69 is in contact with the valve seat 58. As a result, the drain hole 53 and the drain groove 59 are blocked with the seal surface 69 as a boundary, and the drain hole 53 is sealed.
[0071]
Next, as shown in FIG. 6, when the handle 75 is pulled (operated), the valve piston 68 is pulled via the cable 74 and moves toward the back side in the valve space 65 against the coil spring 70. Accordingly, since the seal surface 69 of the valve piston 68 is separated from the valve seat 58, the drain hole 53 and the drain groove 59 communicate with each other and the drain hole 53 is opened. As a result, the liquid accumulated in the intake chamber 32 passes through the drain groove 59 from the drain hole 53 and is discharged out of the intake chamber 32 through the gap between the cover member 54 and the holder member 61.
[0072]
The configuration of the drain device 52 described in the present embodiment is an example, and the valve unit 50 and the operation unit 51 that configure the drain device 52 are realized by configurations other than the configuration described in the present embodiment. May be. Further, in the present embodiment, the valve piston 68 moves toward the rear side of the boat with respect to the drain hole 53 (that is, relatively moves outside the intake chamber 32 along the direction of the liquid flow through the drain hole 53). ) Shows the configuration of the valve portion 50 so that the drain hole 53 is opened. However, conversely, when the valve piston moves toward the front of the boat relative to the drain hole (ie, moves relatively inward of the intake chamber along the direction of liquid flow through the drain hole). You may comprise a drain apparatus using the valve part by which a drain hole is open | released.
[0073]
(Embodiment 3)
FIG. 7 shows a configuration of a slide type valve portion different from the valve portion described above, FIG. 7A shows a state in which the drain hole 53 is closed, and FIG. 7B shows a state in which the drain hole is opened. Each state is shown. In addition, the part which comprises the structure similar to the structure already demonstrated is attached | subjected also in FIG. 7, and the description about the structure and effect | action is abbreviate | omitted in the following description.
[0074]
As shown in FIG. 7, the valve portion 80 in the present embodiment includes a long plate-like valve body 81 and a predetermined vertical direction through the drain hole 53 along the back wall portion of the intake chamber 32. And a guide 82 slidably supported by a distance. A discharge hole 83 is provided in the lower part of the valve body 81, and the hole 83 has substantially the same diameter as the drain hole 53.
[0075]
Further, when the valve element 81 slides downward and is positioned at the lower end of the movable range (see FIG. 7A), the drain hole 53 is closed because the positions of the drain hole 53 and the discharge hole 83 do not match. When the valve element 81 slides upward and is positioned at the upper end of the movable range (see FIG. 7B), the drain hole 53 is opened because the positions of the drain hole 53 and the discharge hole 83 coincide. .
[0076]
A rod-shaped spring 84 is installed between the lower portion of the valve body 81 and the back wall portion of the intake chamber 32, and the valve body 81 is urged downward by the spring 84. Further, one end of a cable 85 is connected to the upper portion of the valve body 81, and the other end of the cable 85 is the deck opening 6 (see FIG. 1) in the same manner as the cable 74 shown in FIGS. (See FIGS. 4 to 6).
[0077]
In the case of the valve portion 80 having such a configuration, the drain hole 53 is closed because the valve body 81 is normally biased by the spring 84 and located at the lower end. On the other hand, when the liquid in the intake chamber 32 is discharged, the valve body 81 is positioned at the upper end by pulling the cable 85 against the spring 84, and the drain hole 53 is opened to discharge the liquid.
[0078]
(Embodiment 4)
FIG. 8 is a partial cross-sectional rear view showing the engine E mounted on the personal watercraft shown in FIG. 1 and auxiliary equipment such as an intake system and an exhaust system. In addition, the part which comprises the structure similar to the structure already demonstrated is attached | subjected also in FIG. 8, and the description about the structure and effect | action is abbreviate | omitted in the following description.
[0079]
As shown in FIG. 8, an intake port 37 and an exhaust port 91 are formed in the cylinder head 36 of the engine E covered with the cylinder head cover 90. The intake port 37 is connected to the intake chamber 32 via the intake manifold 35 as described above. On the other hand, the exhaust passage constituting the exhaust system of the engine E includes an exhaust manifold 92 and an exhaust muffler (not shown) in addition to the exhaust port 91, and the exhaust port 91 is connected to the exhaust muffler via the exhaust manifold 92. It is connected to the.
[0080]
The engine E is formed with a communication path (communication pipe) 93 that communicates from the cylinder head cover 90 to the exhaust port 91 through the cylinder head 36. An end portion 93 a on the exhaust port 91 side of the communication passage 93 is opened as close as possible to the combustion chamber 94 in the exhaust port 91. The other end 93 b of the communication passage 93 is connected to a one-way valve 95 disposed on the cylinder head cover 90.
[0081]
One end 96a of a drain tube (communication pipe) 96 is connected to the bottom of the intake chamber 32 so as to communicate with the inside of the intake chamber 32, and the other end 96b is connected to the one-way valve 95. Yes. The one-way valve 95 operates based on a pressure difference between both sides of the valve, and allows a flow from the drain tube 96 side to the communication passage 93 side while restricting a reverse flow.
[0082]
In addition, in order to introduce secondary air into the exhaust system for the purpose of exhaust purification, etc., a passage or a hole that leads from the outside into the exhaust port 91 (or any pipe line that constitutes the exhaust system) is already provided. The other end 96b of the drain tube 96 may be connected to the passage or hole.
[0083]
In the case of a small planing boat having such a configuration, the one-way valve 95 is opened when the exhaust port 91 has a lower pressure than the intake chamber 32. At this time, the liquid in the intake chamber 32 is sucked up, conveyed along the communication path 93 via the drain tube 96 and the one-way valve 95, and discharged into the exhaust port 91. The discharged liquid is burned by the exhaust discharged from the engine E at the exhaust port 91 or downstream thereof.
[0084]
【The invention's effect】
According to the present invention, it is possible to provide a personal watercraft having a drain structure capable of discharging the liquid accumulated in the intake chamber without directly accessing the intake chamber.
[0085]
[Appendix]
1. A water jet pump constituting a propulsion mechanism of the boat, an engine for driving the water jet pump, and an intake chamber provided in an intake system of the engine;
A personal watercraft comprising drain means for draining the liquid through the drain hole by an operation at a position separated from the intake chamber, the intake chamber having a drain hole at the bottom.
2. 2. The drain means includes a valve body that opens / closes the drain hole and an operation unit that operates the valve body at a position apart from the valve body, and discharges the liquid. A small planing boat described in 1.
3. The personal watercraft according to claim 2, wherein the drain means includes a biasing member that biases the valve body in a direction in which the drain hole is closed.
4). The valve body is movable inward and outward of the intake chamber along the direction of liquid flow through the drain hole, and opens the drain hole when positioned relatively inside the intake chamber. 4. The device according to claim 3, wherein the drain hole is closed when positioned outward, and the biasing member is configured to bias the valve body outward. 5. Small planing boat.
5). The valve body is movable inward and outward of the intake chamber along the direction of liquid flow through the drain hole, and opens the drain hole when positioned relatively outside the intake chamber. 4. The device according to claim 3, wherein the drain hole is closed when positioned inside, and the biasing member is configured to bias the valve body inward. 5. Small planing boat.
6). 3. The personal watercraft according to claim 2, wherein the drain means includes an actuator that drives the valve body to open / close the drain hole.
7). 7. The personal watercraft according to claim 2, wherein the valve body has a tapered contact portion with a valve seat with which the valve body abuts when the drain hole is closed. .
8). The valve body is configured to move between a position where the drain hole is opened and a position where the drain hole is closed along a direction intersecting a flow of liquid passing through the drain hole. A personal watercraft according to 2 or 3.
9. The personal watercraft according to any one of claims 2 to 8, wherein the operation unit includes a cable having one end connected to the valve body.
10. A deck opening is provided at the top of the hull, the drain means has a communication pipe for sucking out the liquid through the drain hole, one end of the communication pipe is connected to the drain hole, and the other end is connected to the other hole. The personal watercraft according to claim 1, wherein a stop plug for sealing an end is detachably provided and is arranged in the vicinity of the deck opening.
11. An exhaust passage for exhausting the engine is provided, the drain device has a communication pipe for sucking out the liquid through the drain hole, one end of the communication pipe is connected to the drain hole, and the other end is the exhaust passage. The personal watercraft according to claim 1, wherein the personal watercraft is connected to the exhaust passage through a one-way valve that allows a flow to the side.
[Brief description of the drawings]
FIG. 1 is a side view of a personal watercraft according to an embodiment of the present invention.
2 is a plan view of the personal watercraft shown in FIG. 1. FIG.
FIG. 3 is a side view showing the engine and intake system accessories mounted on the personal watercraft shown in FIG. 1 and the drain structure;
4 is a side view showing an engine and intake system accessories mounted on the personal watercraft shown in FIG. 1, and another structure of the drain. FIG.
5 is a cross-sectional view showing a detailed configuration of the drain device shown in FIG. 4;
6 is a cross-sectional view showing a state when the liquid in the intake chamber 32 is discharged in the drain device shown in FIG.
FIG. 7 is a schematic diagram showing a configuration of different valve portions including a slide type valve.
8 is a partial cross-sectional rear view showing engines, auxiliary systems such as an intake system and an exhaust system mounted on the personal watercraft shown in FIG. 1. FIG.
FIG. 9 is a schematic view showing various structural principles of a valve body constituting the present invention.
[Explanation of symbols]
1 hull
2 Hull
3 decks
6 Deck opening
32 Intake chamber
38 Drain tube
41 Stopper
50 Valve
51 Operation unit
52 Drain device (drain means)
53 Drain hole
63 Disc
68 Valve piston
70 Coil spring
74 cable
80 Valve
81 Disc
84 Spring
85 cable
91 Exhaust port
92 Exhaust manifold
93 Communication passage (communication pipe)
95 one way valve
96 Drain tube (communication pipe)
E engine
P water jet pump

Claims (2)

A water jet pump that forms a propulsion mechanism of a boat, an engine that drives the water jet pump, an intake chamber that is provided in an intake system of the engine and has a drain hole at a lower portion thereof, and an operation at a position separated from the intake chamber Drain means for discharging the liquid in the intake chamber through the drain hole by
A deck opening is provided in the upper part of the hull, the drain means has a communication pipe for sucking out the liquid through the drain hole, and the communication pipe has one end connected to the drain hole and the other end A personal watercraft, wherein a stopper for sealing the other end is detachably provided, and the other end is disposed in the vicinity of the deck opening . The personal watercraft according to claim 1, wherein a storage box is provided in the hull, and the other end of the communication pipe is supported in the storage box.

Images